Floatless carburetor



M. KREHER FLOATLESS CARBURETOR Filed-March 12, 1929 Aug. 11,1931.

2 Sheets-Sheet 1 five/22 0):

Aug. 11, 1931. M. KI QEHER FLOATLESS CARBURETOR Filed March 12, 1929 2 Sheets-Sheet 2 /A/// W J Patented Aug. 11,1931

MAX KBEHEB, OF FREIBERG, GERMANY, ASSIGNOR'TO CUR'I LUDWIG, F

GERMANY PATENT," OFFICE} LANNABEBG,

FLOATLESS CARB'URETOR application filed March 12, 1929, Serial No. 846,369, and in Germany January 29, 1929.

i This invention relates to =1 floatless c'arburetor, characterized in that it is a carburetor without throttle valve. The construction and the object of the arrangements will be a! hereinafter explained.

Two embodiments of the invention are illustrated by way of example in the accompanying drawings. J j 7 .As however the difference between the two n embodiments concerns only one'single ele-r ment, both embodiments will together. a

ig. 1 shows the improved carburetor n be described elevation.

Fig. 2 is a longitudinal section of F 1g. 1. Fig. 3 is apart section, and illustrates thesecond form of construction.

Fig. 4 shows in elevation the lever for operating the releasing device for the valve.

2o Fig. 5 shows in vertical section, partly in elevation the mushroom shaped valve or injection head.

Fig. 6 is a top plan view of Fig. 5. Fig. 7 is a top plan view of the cup of the valve. 7

Fig. 8 shows in vertical section partly in elevation a modified construction of the valve needle.

Fig. 9 is a similar view as Fig. 8 showing a further modification of the valve needle. The carburetor case is'composedv of two parts 1 and 2. The upper part 1 has a flange 3 at the top end by means of which the,

case is to be connected to the motor, the lower end being offset with regard to the lower part 2, whereby a shoulder 4 is formed. Thelower part 2 comprises further a transverse plate'5 extended in downward directionby a hub 6 and in upward direction by a tubular extension 7. The transverse plate 5 is bored in longitudinal direction. A tubular extension 8 at the right side is internally threaded for connection to the fuel pipe and the'horizontal d5 nel 10 which communicates with the-central bore, of the tubular extension 7. A cali- 11 is mounted in the horizontal brated plug bore 9. T e upper edge 'of the tubular ex- 5 tension 7 is bevelled in inward directionv bore 9 communicates with the vertical chanand forms a seat 12. From the tubular ex tension 7 an air channel 13 extends into the open through the part 2 and in which a regulating element is arranged. To the lower end of the part 2 of the casing a forechamber 14 for the suction air is fixed b means of a screw 15 in the hub 6. The di ference of the two forms of" construction relates merely to this air chamber. As shown in Fig. 1 the "air chamber 14 has two admissions 16 through one of which hot air can be supplied which flows through a conduit heated by the exhaust pipe, or fresh air may be supplied also. In the latter case the pipe is removed and in each of the two admissions 16 a seat is inserted to against the shoulder 4. The inner surface venturi 18 is outwardly inclined at the upper portion in upward direction and at the lower portion in downward direction so that a burr or sharp edge 20 is formed. 86 The fuel valve or injection head is mushroom-shaped. The stem 21 is bored and has at its bottom portion 22 four longitudinal slots 23. The stem ends at the top (id in a threaded neck 24. From the stem 21 radial arms 25 extend which carry on the outer ends a crown 26, fromthe lower surface of which a vertical fiange 27 rojects. The crown 26 carries a ring 28 oi curved cross section and forms, together with this ring, an annular chamber 29. The ring 28 has in- .wardly extending arms 30. A cap nut 32 screwed on the threaded neck 24 and having a central hole 31, rests upon the ends of the radialarms 30 and secures the ring'in its position. In the radial arnis 25 of stem 21 channels 33 are formed which end in the annular chamber 29. i-From the chamber 29 .extend channels 34 in outward direction'and further inwardly directed channels 35. In

the neck 24 of the stem 21 a bearing plate 36 for a ball 37 is mounted.

In the bottom 'portion 22 of the stem 21 a needle -valve is mounted which consists of are illustrated.

In his 1 and 5 the valve consists of a solid bo y 39. As shown in Fig. 8 the valve body 40 has a central bore stepped toform a seat 41. The bore is closed at the upper end b a nipple 42 havin a central channel 43. 1X1 the walls above t e seat 41 passages 44 are arranged. Near the lower end tap very narrow channels 45 are provided in the boring. The seat 41 carries a closing cone 46.

The construction shown in Fig. 9 is similar; only the channel 45 is omitted and a channel 47 extends through the point.

' The mushroom-shaped valve or injection head is inserted into the tubular extension 7 so that the needle engages with the channel 10, this channel and also the horizontal bore 9 being constantly filled with benzine from the benzine reservoir. The needle carries the mushroom-shaped upper portion. Be-

tween this mushroom-shaped portion and theseat 12 a gap 48 remains and betweenthe lower end of the valve and the bottom of the {.ugmlar extension 7 a hollow space 49 is? On a stationary shaft 50 a link 51 is keyed to which t o rods are hingedly connected. The rod 52 'a guided in an eye 53 and bears against the venturi 18. The other rod 54 is tubular anda rod 55 is telescoped in the same. A collar 56 of rod 55 can oscillate in the centraThole 31 and carries the ball 37.

The operation when the valve 39 is used, is as follows: I I

The suction draft at the starting lifts the mushroom and through the same the needle so that the channel 10 is slightlyopened and lets pass the quantity of benzine required for the starting. The benzine rises in the stem 21' andflows through the channels 33' into the annular chamber 29 and thence through the outflow channels 34 and 35. An air channel 13a terminates in the hollow space 49. When starting the air flows from the channel 13 through 13a into the hollow space 49 and then into the hollow stem 21 along the same path as the benzine and forms a mixture with the benzine which passes off through the channels 34, 35.

After the throttle valve has been further opened the air from the forechamber 14 flows first around the cu the flange 27 of the valve as uncovered the passages 48, through the cup around the inner outflow channels. sion is automatically increased according to and, as soon as The benzine admisthe increaseof air admission in the desired relation. When .the mushroom-shaped valve has been lifted to thehighest position, the

air and benzine supply is maximum.

The mushroom-shaped valve or injection head is automatically lifted b the suction draft but must be liberated y means of a lever 57 rotating the shaft 50 so that the rod 52 presses the venturi 18 upon this ring 19, the tubular rod 54 ascending and draw-,

sages 44 into the hollow stem 21. he

mushroom-shaped valve is lifted only at full speed, the operation being otherwise similar to that described above.

The security against upsetting of the needle at mis-ignltions has further to be mentioned. -The shock from mis-ignition depresses the mushroom-shaped valve or injection head the distance of the gap 48 until the cup is bearing against the seat 12,

this depression being rendered harmlessfor the needle by the free space 49.

I claim:

' 1. injection head buretors, comprising in combination a hollow stem provided with slots, a head composed of radial arms, and a ring'with outletstowards the inside and outside in the suction air current flowing not only around but also through said head. a

2. An injector head as specified in claim 1, comprising in combination with the hollow stem a support with air feed adapted to carry said hollow stem and forming a mixing forechamber.

3. In an injector head as specified in claim 1, a flange adapted to first close and then open the path for the suction air.

4. An injector head as specified inclaim 1, comprising in combination with the hollow stem a needle valve, and a bottom por for fioatless cartion of said stem'forming a seat for said needle valve. 

